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autor: andrybak wystawiona: Lut. 4, 2023 ·

The addon only wraps the lines visually. The actual outgoing emails will still have very long lines, which is not good for plain text mailing lists.

Ta opinia jest o wcześniejszej wersji dodatku (1.4.1). 

przez Jan Kiszka (Autor) dnia Lut. 4, 2023 ·

Did you "make sure that "mailnews.send_plaintext_flowed" is disabled" (see add-on description)? If so, please share more details about your setup.
Your use case is also my use case and the primary reason why I'm maintaining this.